Electrohome VistaGRAPHX 2500, User Manual

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GLOSSARY
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VistaGRAPHX 2500 User's Manual
A type of rear-projection screen which re-directs light through the screen to
increase image brightness in front of the screen. Screen gain is usually greater
than 1 but audience viewing angles are reduced.
PAL (Phase Alternating Line) video is a 50 Hz standard with 768 x 576
resolution. It is found on some video tape and disk players (used primarily in
Europe, China and some South American and African countries).
A distortion of the image which occurs when the borders are concave or convex.
The smallest discernible element of data from a computer-generated image.
The phase of the pixel sampling clock relative to incoming data.
The frequency of the pixel sampling clock, indicated by the number of pixels per
line.
The projector is at presentation level when an image from a source is displayed
without the presence of a slidebar, menu, pull-down list, or error message. For
example, if a help page is displayed, the projector is not at presentation level.
The distance between the projector's front feet and the screen. Also called
"Throw Distance”.
The type of code format utilized by remote keypad(s). For any keypad, the
default protocol from manufacture is Protocol A. By using two different
protocols, two projectors may be used side by side while being controlled
independently by their remote IR keypads.
A selectable menu item that unfolds into a list of options pertaining to a given
parameter.
A translucent panel for screen projection. Incident light travels through the
incident surface of a rear screen and forms an image on the other surface.
The ability to manipulate through software commands the physical size,
placement and/or aspect ratio of an image.
The maximum number of alternate white and black horizontal lines that can be
distinguished on a screen when a photographic target is placed between the lens
and a light source, and illuminated by that light source.
The maximum number of pixels that the projector can display horizontally and
vertically across an image.
The minimum time required for a CRT projector to move the position of the
scanning spot from the right edge to the left edge.
The time required by the video amplifier of the projector to increase its output
from 10% to 90% of the maximum value.
The video output (analog or digital) of most computers. Analog RGB video can
have 3, 4, or 5 wires — one each for red, green, and blue, and either none, one or
Optical Screen
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PAL Video
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Pincushion
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Pixel (picture element)
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Pixel Phase
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Pixel Tracking
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Presentation Level
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Projector-to-Screen
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Distance
Protocol
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Pull-down List
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Rear Screen
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Resizing
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Resolution (lens)
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Resolution (projector)
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Retrace Time
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(Horizontal)
Rise Time
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RGB Video
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